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BMW 3-Series (E90 E92) Forum
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Dealing with the alphabet soup EGR/DPF/SCR
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02-17-2015, 08:03 PM | #45 |
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Did you by chance unplug your differential pressure sensor? I Know with the downpipe you use only one temp sensor. Try plugging in all three. Just make sure the car is not running and ignition is not on.
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02-17-2015, 10:29 PM | #46 | |
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![]() Good thing you didn't go bigger because that nick would be much worse..... |
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02-18-2015, 04:58 AM | #47 | ||
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02-18-2015, 06:14 AM | #48 | |
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And what would be the expected result? No limp home message? What about the NOx sensor, urea metering unit and differential pressure sensor? Leave those unplugged? |
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02-18-2015, 09:37 AM | #49 |
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I will add it to my thread with the actual mod being that this one is dealing with several different things......
See my 1st post in the wastegate options thread. Last edited by iaknown; 02-18-2015 at 11:21 AM.. |
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02-18-2015, 04:37 PM | #50 |
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Ah, yes. Looking closer at the second picture I can now see that you shaved off some material at the area the flap would hit when it is fully open. Yours now opens wider to allow more room for the drill/reamer. Thanks for pointing this out so other users don't make my mistake. I assume you used a dremel with a grinder attachment?
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02-18-2015, 05:09 PM | #51 | |
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Last edited by Yozh; 02-19-2015 at 02:13 PM.. |
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02-18-2015, 06:10 PM | #52 | |
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On the other hand, another argument for reconnecting the sensors and tucking them up are the following: 1. The connectors are shielded against salt mist and thus against corrosion. 2. Open connectors are acting as attennas and thus open doors for electromagnetic fields (EMF) to enter the DDE which is potentially harmful to the components inside. I'll ask Jarek when I get a chance. Until then I'll follow your advice. Thanks mate! Edit: I just realized that there might be a slight misunderstanding. I have not yet send in my DDE for tuning. This test was to figure out if it is posssible to install the downpipe first and then drive to Jarek in order to get the tune. So the DTCs I posted were expected. I'll also edit the post with the DTCs in order to clarify. Last edited by Mik325tds; 02-19-2015 at 06:13 AM.. |
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02-18-2015, 08:33 PM | #53 |
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I'd keep the differential pressure sensor connected, and use the upstream side to measure after turbo pressure (atmospheric pressure to the downstream side). Then you will have something to monitor the effect of any additioanl mods you might want to do the exhaust system.
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02-19-2015, 05:12 PM | #54 | |
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02-19-2015, 05:53 PM | #55 |
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There are other options like the one in this image. I guess this is one of the advantages of a gutted DPF/DOC.
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02-20-2015, 09:15 AM | #56 |
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The differential pressure tubes are not a good idea on the downpipe or the dpf.. especially with the minimal knowledge you'd gain by measuring exhaust pressure.. Enough said
P.s. That band clamp with the o2 sensor bung looks like something a teenager would put on a mid 90s honda |
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02-21-2015, 09:02 PM | #58 |
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There are a few folks with some horsepressure in these forums who have been quite interested in measuring the drive pressure across the turbos.
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02-21-2015, 09:04 PM | #59 |
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02-22-2015, 04:31 PM | #60 |
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I wasn't going to use a clamp like that. Would be agains my astetic taste as well. And since I have not much use for the exhaust pressure info, the differentail pressure sensor is going back into the car like this:
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02-22-2015, 04:36 PM | #61 |
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One more thing to do before sending the DDE to Jarek: Flushing the Urea tank. I first drained the remaining urea from the drain ports as described in the attached document.
The picture shows draining the passive tank. Last edited by Mik325tds; 02-22-2015 at 04:46 PM.. |
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02-22-2015, 04:43 PM | #62 |
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I then refilled both tanks with destilled water and used EDIABAS to activate the pump that pressurizes the hose to the metering unit. In order to do so, the job start_scr_motortest1 has to be run and stopped first, then put in 50;50 (dosis, PWM duty cycle) in the Arguments field and start_scr_motortest2. I let it run for a minute or so until it stopped by itself. This way there's no remaining urea in the hose or system that can crystallize and maybe clog the system for future use.
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02-22-2015, 08:17 PM | #63 |
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Yozh, per post #61, this is what i did to drain. I used a manual vacuum pump thing for siphoning fuel but it didn't fit. I only got about 1.5 gallons to come out. I'm unsure if all will come out with this method. I should have had about 69% of full system since i had only driven 4000 miles and that would have left about 9000 of the normal 13000 mile range. 9/13=69%. Perhaps I got shorted on my last DEF topoff. No matter, as its getting removed in the near future. I need to get access to a lift to remove exhaust.
Mik325, that was a great idea to purge the line of urea and replace with water. Be careful for cool weather though. Urea freezes at 19F and of course water at 32F. You may want to redrain tanks to get water out if it is real cold where you are. How much urea did you collect in your draining? EDIT: Something just occurred to me. Since my SCR wasn't turned off during 3500 miles of using Ecotune programming and EGR was blocked, I may have been spraying at a higher rate. If car were without mods, both EGR and SCR function to reduce NOx. With EGR blocked, SCR was on its own to reduce NOx for 4000 miles. This is a hypothesis of mine, no data to back it up. I do not know to what level SCR was "closed loop" trying to control NOx running the Ecotune. Does anyone out there running EGR blocked notice a higher rate of refilling urea? Last edited by BB_cuda; 02-22-2015 at 08:30 PM.. |
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02-23-2015, 11:18 AM | #65 |
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If I extrapolate out Yozh's numbers to 13,000 miles. (13,000/5400)*2.5=6.01 gallons. That sounds about right. So, the dealer blew off putting DEF in my car or there is still a bunch in there I can't drain out.
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02-23-2015, 05:53 PM | #66 |
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I was able to get about 2 gallons in each tank after draining even though I should have been able to get about 3 gallons into the passive tank. All 4 gallons came back out through the drain ports.
I'm planning to deinstall the tanks to make some room for natural gas tanks if possible. BB_cuda, do you have some documentation on how to uninstall the tanks? |
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